code: def test_mark_groups_squares(self):
      plt.close("all")
      g = Graph.Ring(5, directed=True)
      fig, ax = plt.subplots()
      plot(
          g,
          target=ax,
          mark_groups=True,
          vertex_shape="s",
          layout=self.layout_small_ring,
      )
  
imports: import os
  import unittest
  from igraph import Graph, plot, VertexClustering, Layout
  from ...utils import overridden_configuration
label_desc: Use image node_id 9 for calling the GraphTestRunner obj's underlying member method code with example usage: obj.test_mark_groups_squares() without return types